Percentages appear everywhere in daily financial life: GST on a price, the salary increase percentage in a counteroffer, your exam score out of a total, or the annual return on an investment. This three-in-one tool handles the most common scenarios without switching pages — find what percentage X is of Y, calculate X% of a value, or measure the percentage change between two figures. Results are instant and shown with a worked breakdown.
What is X% of Y?
X is What % of Y? (Reverse Lookup)
Percentage Change (Growth/Decline)
What Does This Percentage Calculator Do?
This multi-function tool solves the three most common percentage problems: calculating what percentage one number is of another, finding a percentage of a number (e.g., 18% of 5,000), and calculating the original value before a percentage increase or decrease was applied. It is used for exam marks analysis, discount calculations, salary increase assessments, and tax computations.
How to Use This Calculator
Select the type of percentage calculation you need:
What % is X of Y? — Enter both values to find what percentage X represents of Y.
X% of Y =? — Enter a percentage and a base value to find the absolute amount.
X is Y% of what? — Enter the result and the percentage to find the original base value.
% change between X and Y — Enter an old value and new value to find the percentage increase or decrease.
Percentage Formulas
What % is X of Y: (X ÷ Y) × 100 X% of Y: (X ÷ 100) × Y X is Y% of what: X ÷ (Y ÷ 100) = X × (100 ÷ Y) Percentage Change: ((New − Old) ÷ Old) × 100
Worked Examples
Exam marks: Student scored 472 out of 600. Percentage = (472 ÷ 600) × 100 = 78.67%
Salary increase: Salary rose from PKR 80,000 to PKR 95,000. Change = ((95,000 − 80,000) ÷ 80,000) × 100 = +18.75%
GST calculation: Product costs PKR 2,500 + 17% GST. Tax = 17% of 2,500 = PKR 425. Total = PKR 2,925.
Back-calculation: After a 15% discount, price is PKR 1,700. Original price = 1,700 ÷ 0.85 = PKR 2,000.
Practical Use Cases
FPSC/PPSC exam results: Calculate your percentage score for competitive exams where raw marks are given.
GST and sales tax calculations: Pakistan applies 17% GST on most goods. Calculate the tax component separately from the base price.
Salary negotiation: Convert a salary increase in PKR to a percentage to understand the real value of an offer.
Investment returns: Convert PKR profit on an investment to a percentage return for meaningful comparison with other options.
Common Mistakes to Avoid
Percentage vs percentage points: If interest rates go from 12% to 15%, that is a 3 percentage POINT increase, not a 3% increase. The actual percentage increase is ((15−12)÷12)×100 = 25%.
Applying a percentage twice: A 20% discount followed by another 20% discount is NOT a 40% total discount. It is 1 − (0.8 × 0.8) = 36% total reduction.
Base confusion in back-calculation: "PKR 400 is 80% of what?" is NOT 400 × 0.8. The correct answer is 400 ÷ 0.8 = PKR 500. Dividing (not multiplying) reverses the percentage application.
Frequently Asked Questions
How do I calculate GST on a price in Pakistan?
Pakistan’s standard GST rate is 17%. GST Amount = Price × 0.17. Total price with GST = Price × 1.17. To find the GST-exclusive price from a GST-inclusive amount: divide by 1.17.
How do I calculate percentage marks in Pakistan?
Percentage = (Marks Obtained ÷ Total Marks) × 100. For example, 875 out of 1,100 = (875 ÷ 1,100) × 100 = 79.55%. Grade boundaries vary by board — check your specific board’s grading criteria.
What is the difference between markup and margin?
Markup = (Profit ÷ Cost) × 100. Margin = (Profit ÷ Selling Price) × 100. A 25% markup on a PKR 1,000 item gives a selling price of PKR 1,250, but the margin is only 20% (250 ÷ 1,250 = 20%).
📅 Last Updated: April 2026📋 Based on standard arithmetic and FBR GST regulations